IME it was striking how the intro classes for sociology, psychology, and poli sci all involved sketching out different approaches to those subjects and some historical background of the disciplines, whereas intro to econ is basically "here's how we model behavior in econ, and here's how you express that as a graph."
I think a lot of how econ's taught can be chalked up to a desire to be treated like a STEM discipline and not lumped in with the other "soft" sciences.